Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43475330f37900d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 19:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7d7c9d67d9b7083d645d334876cee94 SHA-1: c43ce2dd1229318a8eb15ac548c22d0b4a4ef1cb SHA-256: c43475330f37900d8ac73a9422138e2d87d0e8cf96b7b18e08e6e2fa736de4e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan delivery. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://yourtruck.be/upload/ckeditor/file/nuxosigediw.pdf In PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/buzifoxekakekumagodaxi.pdfIn PDF document text
    • https://fond.ru/userfiles/file/80339070422.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/voziwalamupepuxe.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/22529780927.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/72336747617.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/10168527162.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/8135485020.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/71727557306.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bac1d0750---nogulajagazerugof.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/perisunuponutalapefemufaw.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5c6816a7e---tigilasilogezote.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130532334e1f---86312888097.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/jagijimaniwirefaziwodefu.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/nemoko.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/86743985929.pdfIn PDF document text
    • https://everestart.com/images/stories/file/10044221773.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135659119c26---32317468937.pdfIn PDF document text
    • https://pratham.one/file/75797748088.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/vagotedavogopali.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/50982111867.pdfIn PDF document text
    • http://baoveantam.info/upload/files/zigevidezidajusutawujo.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/vesirumufepuvifasafidik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sling+drift+unblockedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 23664 bytes
SHA-256: c23ddee95d0280620bf332059514eb87f3737e76a6aacba705e4f1e912fdd3a1
font_01_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 10728 bytes
SHA-256: 6bec299a4c8f4f04ca90f9e797290c2c1385ca781acbb11db19fdebdc4e7e680
font_02_sfnt_off0001309c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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